The photo shoot times won't be known until the schedule is released (normally 1-2 weeks prior to the event). It is possible that some photo shoots will take place before 11am (which is when Standard ticket holders can enter).
If this is the case then you can upgrade your ticket on the day, and enter at 9am. Bring your Standard ticket, and join the Early Bird pay-on-the-day queue, hand over your ticket and pay the difference in price..
Oh ok, phew. Thank you